The functional groups in an organic compound can frequently be deduced from its

Question

The functional groups in an organic compound can frequently be deduced from its infrare

d absorption spectrum. A compound, C3H6O2, exhibits intense absorption at 1740 cm-1, accompanied by a band at 1050 cm-1. No absorption above 3000 cm-1 is present .

What functional class(es) does the compound belong to?
List only classes for which evidence is given here. Attach no significance to evidence not cited explicitly.
Do not over-interpret exact absorption band positions. None of your inferences should depend on small differences like 10 to 20 cm-1.

The functional class(es) of this compound is(are)            .(Enter letters from the table below, in any order, with no spaces or commas.)

a. alkane (List only if no other functional class applies.) b. alkene h. amine c. terminal alkyne i. aldehyde or ketone d. internal alkyne j. carboxylic acid e. arene k. ester f. alcohol l. nitrile g. ether

Explanation / Answer

A compound, C3H6O2, exhibits intense absorption at 1740 cm-1, accompanied by a band at 1050 cm-1. No absorption above 3000 cm-1 is present .

C3H6O2

DBE = C - (H/2) – (x/2)+ (N/2) +1

where C = number of carbon atoms, H = number of hydrogen and halogen atoms, and N = number of nitrogen atoms, x= number of halogen atoms

DBE = 3- (6/2) – (0)+ (0) +1

=3-3+1

=1

Thus this compound has one double bond.

It intense absorption at 1740 cm-1 due to ester group. ,

It also absorbs at 1050 cm-1 due to C-O bond.

k.ester

1740cm-1 corresponds to ester

1050cm-1 corresponds to C-O stretching

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